66841749 has 48 divisors (see below), whose sum is σ = 110597760. Its totient is φ = 38586240.

The previous prime is 66841741. The next prime is 66841757. The reversal of 66841749 is 94714866.

It is an interprime number because it is at equal distance from previous prime (66841741) and next prime (66841757).

It is not a de Polignac number, because 66841749 - 2³ = 66841741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66841741) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 158559 + ... + 158979.

It is an arithmetic number, because the mean of its divisors is an integer number (2304120).

Almost surely, 2^66841749 is an apocalyptic number.

66841749 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

66841749 is a deficient number, since it is larger than the sum of its proper divisors (43756011).

66841749 is a wasteful number, since it uses less digits than its factorization.

66841749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522 (or 519 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 66841749 is about 8175.6803386630. The cubic root of 66841749 is about 405.8347847920.

The spelling of 66841749 in words is "sixty-six million, eight hundred forty-one thousand, seven hundred forty-nine".